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powerpc/eeh: Fix possible null deref in eeh_dump_dev_log()

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If an error occurs during an unplug operation, it's possible for
eeh_dump_dev_log() to be called when edev->pdn is null, which
currently leads to dereferencing a null pointer.

Handle this by skipping the error log for those devices.

Signed-off-by: Sam Bobroff <sbobroff@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Sam Bobroff 2018-09-12 11:23:20 +10:00 committed by Michael Ellerman
parent 747b217608
commit f9bc28aedf
1 changed files with 5 additions and 0 deletions
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5
arch/powerpc/kernel/eeh.c
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@ -169,6 +169,11 @@ static size_t eeh_dump_dev_log(struct eeh_dev *edev, char *buf, size_t len)
int n = 0, l = 0;
char buffer[128];
if (!pdn) {
pr_warn("EEH: Note: No error log for absent device.\n");
return 0;
}
n += scnprintf(buf+n, len-n, "%04x:%02x:%02x.%01x\n",
pdn->phb->global_number, pdn->busno,
PCI_SLOT(pdn->devfn), PCI_FUNC(pdn->devfn));